Browse Prior Art Database

Low Inertia High Torque Stepper Motor

IP.com Disclosure Number: IPCOM000076683D
Original Publication Date: 1972-Apr-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Chai, HD: AUTHOR [+2]

Abstract

A low-inertia, high-torque stepper motor has a stator 10 with drive windings 12 and a shaft 14, on which is mounted a rotor 16 comprising oppositely disposed cup-shaped elements. Magnetic flux for the rotor is provided by permanent magnets 18 placed about the stator. With aluminum nickel alloys the magnet may be positioned as shown. With ferrite materials the magnet may be positioned between the two stator sections. A cylinder 30 between the rotor elements provides a path for the permanent magnet flux. The stator, rotor and cylinder, which are sectioned, are of a soft iron.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Low Inertia High Torque Stepper Motor

A low-inertia, high-torque stepper motor has a stator 10 with drive windings 12 and a shaft 14, on which is mounted a rotor 16 comprising oppositely disposed cup-shaped elements. Magnetic flux for the rotor is provided by permanent magnets 18 placed about the stator. With aluminum nickel alloys the magnet may be positioned as shown. With ferrite materials the magnet may be positioned between the two stator sections. A cylinder 30 between the rotor elements provides a path for the permanent magnet flux. The stator, rotor and cylinder, which are sectioned, are of a soft iron.

By placing the permanent magnet about the stator, the rotor inertia is reduced and a greater magnetomotive force is obtained, resulting in a higher torque and acceleration for a given input.

1

Page 2 of 2

2

[This page contains 1 picture or other non-text object]